I need a Girl's take on this?

There is this amazing girl who i met this summer. She does not go to my school and all the guys want her. Not to bragg but i guess alot of the girls at my school like me but im not interested in any of them. I am interested in this one girl named kate. I have only hung out with her 4 times and we talk sometimes but it never really gets anywhere. My guy friend told me she likes me and he told her she should ask me to sadies. She said she didn't want to sound like a creep but she asked me to sadies at her school anyway. I recently hung out with her but she usually talks more to my other guy friend. I texted her recently and she texted back but she didnt seem into the conversationand i asked her if was going to see her sat and she said maybe dot dot dot and then a movie. Then sat roled around and she never texted me. Did she want me to text her? My friend said she likes me but she doesn't show it that much. Does she like me? and if so how do i take our relationship to the next level? how can i start talking to her and hanging out with her more? THANKS